Positive stock-feed stop



April 10, 1928.

J. KARMAZIN POSITIVE sTocK FEED sTor Fi d y-12. 1926 2 Sheets-Sheet 1 [N V'EN TOR JOHN KARMAZIN mm NM April 10, 1928.

J. KARMAZIN POSITIVE swoqx FEED swor Fil y 12. 1926 '2: Sheets-Sheet 2 IN V/zN TOR Patented Apr. 10, 1928.

JOHN KARMAZIN, OF DETROIT, MICHIGAN.

POSITIVE I STOCK-FEED' STOP. I

Application filed Kay 12,

This invention relates to a machine for formlng radiator elements of the type described in my copending application, Ser.

No. 723,860, and particularly to a means formore positively stopping the strip of radiator forming material for its successive operations on its passage through the machine.

In my prior application, Ser. No. 723,860, I have described a machine for forming radiator elements in= \vl1icl1 a strip of radiator element forming material is passed between a pair of cooperating punching dies and a lurality of tubular projections formed rom and integral with the Strip. The bottoms of these projections are" perforated and the stri is cut off at predetermined lengths ,to orm radiator elements which, when compacted together with the tubular projections in telescoping relation, form a radiator having water conduits passing therethrough. The strip of material is drawn through the machine by a pair of friction rollers which are continuously operated and which slide over the surface of the strip when the strip is held in position for the operation of the dies. The sides of the strip, after the punching operation, are trimmed by cutter guides which cut a rec tangular piece of metal from the sides at eachrevolution of the machine; Shoulders are thus formed on the edge of the strip and when the stripis released by the dies and moved forward again by the rollers, these shoulders move forward until they contact with portions of the side walls of the dies, which stops the strip in position for another operation of the punches. The cutter guides,

therefore trim the side ed es of the strip and at the same time provi e means to stop the strip intermittently as it passes through themachine. It has been found, however, in the use of very thin sheet metal for forming the radiator elements, after the strip has. been trimmed by the cutter guides and moved forward so that the shoulders left by the cut out portions contact with the side walls of the die that the metal is not strong enough to stop the strip but has a tendency to curl or tear and allow the strip to move forward in the machine beyond the point, for the next operation of the punches, so that the tubular projections do not line up with the punching dies for the next successive step.- Also it has been found desirable, in some instances, to leave the radiator element entirely untrimmed on the sides, where- 1926. Serial No. 108,463.

by a greater heat-radiating fin is provided and greater strength is provided in the fin by virtue of the roughened edges caused by the drawing of the metal to form the tubular projections.

. Itr is the principal object, therefore, of this invention to provide a means for positively slo 'iping the progress of the strip of metal through the machine in the proper position for-each successive operation of the dies without depending upon the cutter guides and the trimmed edges of the strip.

Another object of the invention is to provide a positive stop mechanism for a radiator element forming machine which will engage one or more of the tubular projections on the radiator element forming -strip, move forward with the stri a redetermined distance, stop the strip, a ter such forward movement, in position to'be acted upon by the forming dies, and automatically return to its original, position when the stri is held by the dies whereby it will be in posltion'to engage the next succeeding tubular projections at the next operation of the ma' chine.

Another object of the invention is to provide a positive stop feed mechanism for radiator element forming machines which may be easily constructed at small cost.

Another object of the invention is to provide a positive stop feed mechanism for radiator element forming machines which may be added to an existing machine without changing the design thereof.

Other objects and advantages of the invention will appear as the description proceeds. I

In the drawings, in which one embodiment of the invention has been illustrated:

Figure 1 is'a sectional side elevation of a portion of the radiator element forming machine embodying my invention;

Figure 2 is a sectional end view of the positive stopping means taken on the line 2-2 of Figure 1; and

Figure 3 is a plan view of the portion'of the radiator element forming machineem bodying my invention.

Referring more specifically to the drawings, the radiator element forming machine comprises a base 10, supporting a stationary die member 11 with which a reciprocat ng die member 12 carrying a series of ipunchlng dies 13' is adapted to cooperate. A pair of feed rollers 14 and 15 are rotatably mounted on a bracket 14" attached to the bed of the machine and are continuously driven by suitable gearing 14' communicating with the moving parts of the machine. A stationary knife blade 17 and a cooperating movable knife blade 16 are mounted in front of the rollers 14 and and are also connected by means of suitable levers and cams to the moving parts of the machine, so that the- The above describes the radiator elementforming machine substantially as constructed prior to the present invention, which adds to this structure a bracket 18 which is attached to the bed of the machine and has a pair'of arms 19 adapted to extend up on either sideof the .strip and pivotally support at 20 a lever 21 which extends toward the reciprocating die member 12. An adjustable contact bolt 22 may be provided in a bracket 23, attached to the reciprocating die member 12 and may be adapted to engage the lever 21 at every downward movement of the reciproeating die 12. A plate 24 integral with the lever 21 extends forwardly from the other side of the pivot 20, substantially parallel to the radiator element forming strip 10 pass ing through the machine. The plate 24 is cut out on the lower side thereof to form a guideway or track 24 for a second late25' which is slidably retained against t e plate '24 by means of strips 26 attached to the plate .24 b screws 27. A pluralit of ins 28 are rigi 5 attached to the slida le p ate 25 and exten downwardlyand are ada ted to co- 0 erate with the tubular projections 10 on t e stri 10 of radiator element forming materia A pin 29 is also rigidly attached to the plate 25 and extends upwardly through a slot 30 in the plate 24, which is long enough to permit theplate 25 to move longitudinally a distance equal to the distance between the successive punching dies of the reciprocating die 12; A pin 31 is rigidly attached to the plate 24 and a spring 32 connecting the pin 31 and the pin 29 urges the late 25 toward the pivot andv normally -hol s it in a position with the pin 29 against the rear of the slot 30. Springs 33 are att-aehed between suitable hooks on the bracket 18 and pins 34 on the side of the plate '24 to normally hold the plate down in contact with the strip 10" of radiator element forming material.

In the operation of the machine, the reclprocating die member 12 moves downwardlyforming the strip between the cooperating dies on themembers 11 and 12 and may be omitted.

the contact bolt 22 depresses the lever 21 thereby raising the plate 24 and therefore lifting the pins 28 awa from the radiator element forming strip. The spring 32 draws the plate 24; towards the pivot 20 and holds it in its rearward position. When the die head 12 moves upwardly, the lever 21 is free to move upwardly and the plate 24'is pressed downwardly against the strip by thesprings 33. The pins 28 engage certain of the formed 'tub'nlar projections 10 on the radiator element forming strip 10 before the dies -13, and the cutters 35 attached to the reciprocating die member 12 have been lifted out of the depressions on theradiator element forming strip. clear of the strip, the rollers 14 and 15 pull the strip forward, the plate 25 moving forward with the strip until the pin 29 strikes the outer edge of the slot 30. The strip is thereby stopped and held in this position until the dies 13 start to move down again with the 'head 12. The dies 13 engage the next successive tubular projections before the lever 21 is depressed. When the lever 21 is depressed, raising the pins 24 from the strip, the dies 13 hold the strip firmly in place to complete the next forming operation and the plate 25 is again returned .out of the lower dies of the plate 11. here an untrimmed strip is desired, the cutters 35 From the above it will be evident that-I have provided a positive stop for the strip of radiator element forming material passing through the machine in which the tubular projections themselves are engaged, thus causing nodamage to the strip and eliminating the necessity for the shoulders 35 and the cutter guides 35 which may be used solely to. trim the side strip, as illustrated in Figure 3. Any number of pins 28 may be used on the stop mechanism to engage the \Vhen these dies are' strip so that the strain of any one of-t'he tubularw projections caused by stopping the strip against the pull of the rollers 14and 15 will be negligible. 5

Various modifications of the stopping means shown and'described may be resorted to without departing from the spirit of the invention or the scope of the appended claims.

What I claim as my'invention is:

1. In a radiator element forming a machine, upper and lower cooperating die members, means to constantly urge a strip a pair of cooperating'dic members, means to constantly urge a strip of radiator element forming material through said machine bee tween said die members, and means operated by one of said die members adapted to positively engage said strip, when said dies are separated and permit said strip to move forward a predetermined distance, whereby said strip is positioned for the'next operation of thedies.

3. In a radiator element'forming machine, a pair of cooperating die members, means acting to constantly urge a strip of radiator element forming material throu h said machine and between said die mem ei's, means to positively engage said stri. and permit a limited forward movement t ereof, means to normally hold said engaging means in contact with said strip and means to lift said engaging means free from said strip when said die members are contacting with said strip.

4. In aradiator element forming machine, a stationary die member adapted to operate on a strip of radiator element forming ma terial, a. reciprocating die member, means to constantly urge a strip of radiator element forming material through said machine and between said dies, means to positively engage said strip and permit a limited forward movement thereof, means to normally hold said engaging means in contact with said strip and means cooperating with said reciprocating'die to release said engaging means when said dies are in engagement with said strip.

5. In a radiator element forming machine, a pair of cooperating dies, means to constantly urge a strip of radiator element forming material through said machine and between said dies whereby tubular projections are formed on said strip, means to engage a plurality of said tubular projections, means to permit a limited forward movement of said engaging means, and means cooperating with said dies to lift said engaging means out of engagement with said tubular projections when said die members are acting upon said strip.

6. In a radiator element forming machine, a pair of cooperating die members for forming a plurality of tubular projections on a strip of radiator element forming material by a series of successive punching operations, means to constantly urge said strip and adapted to engage a like number'o through said machine and between said die members, a plate normally arallel to said strip and pivoted at one end thereof above said strip, means slidablymounted on said plate toengage a plurality of said tubular projections and permit a limited forward movementof said stri and means cooperating with said die mem )ers to turn said plate about its pivot and lift said engaging means clear of said tubular projections when sai dies are acting upon said strip;

7. In a radiator element forming machine,

a pair of cooperating die members for forming a plurality of tubular projections on a strip of radiator element forming material by a series of successive punching operations, means to constantly urge said strip through said machine between said dies, 21

plate pivotally mounted above-and parallel to said strip, means slidably mounted on said plate and adapted to normally engage aplurality of said tubular projections and permit a limited forward movement of said strip, means cooperating with said die members to rotate said plate about its pivot and lift said projection engaging means clear of said strip when said die members are acting on said strip and means to return said p rojection engaging means to its normal position when disengaged from said strip.

8. In a radiator element forming machine, a pair of cooperating die members for forming by successive punching operations a plurality of tubular projectlons on a strip of radiator element forming material, means to constantly urge said strip through said machine and between said die members, a plate pivotally mounted above and parallel to said strip, a second plate slidably mounted for limited longitudinal movement on the lower side of said first plate, means to normally hold said second plate in its extreme rearward position, a plurality of pins projecting downwardly from said second lafie t e tubular projections on said strip whereby said strip may be moved forward a distance limited by the movement of said second plate, and means cooperating with said die members to rotate said first plate aboutits pivot whereby said pins are lifted clear of said strip when said die members are act- 9. In a positive stop feed mechanism for j a radiator element forming machine, a plate pivotally mounted above and parallel to the strip of radiator element forming material, a second plate slidably mounted for limited longitudinal movement on the under side of said first plate, spring means to normally hold said second plate in its extreme rearward position, a plurality of pins extending downwardly from said second plate and adapted to engage with the tubular projections on said strip and means to rotate said first plate about .its pivot and lift said pins out of engagement with said strip when said strip is held by said die members and to return said first. plate to its normal position whereby said pins engage said strip when said die members are separated.

10. In a positive stop feed mechanism for aJnaehine for forming radiator elements, means for engaging a strip of radiator element ftn'ming material, means to stop the forwardmovement of said engaging means when said strip has moved forward a predetermined distance whereby said strip is positively stopped in its course through the 'machine, means to release said engaging means from said strip when said strip is held against forward motion by the formin dies of the machine, means to move sai engaging means rarwardly'and means to attach said engaging means to said strip before said strip is released by said forming dies. i 11. In a radiator element forming machine, a pair of cooperating die members for forming by a seriesof successive punching operations a plurality of tubular projections on a strip of radiator element forming material, means to draw said strip through said machine, means to sever said strip in elements of a predetermined length, and means to grasp said strip and stop said'strip after a limited forward movement thereof. In testimony whereof I have aflixed my signature to this specification.

' JOHN KARMAZIN. 

